Detecting and evaluating flicker from lighting systems during field assessments of lighting installations

This paper provides guidance to practitioners in visual ergonomics and lighting design, as well as lighting specifiers and installers, on how to detect flicker during field surveys of lighting systems and avoid flicker in lighting system upgrades or retrofits. Flicker has been identified as a problem in several lighting installations in different building types. A common perception is that LED lighting systems are flicker-free. Measurements indicate that LED sources can produce as much flicker as fluorescent lamps with magnetic ballasts. While flicker might be invisible to the human eye, it can easily be detected with very simple instruments available to most; namely mobile phones